American Magnetics 430, Инструкции по установке, эксплуатации и обслуживанию

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R
EV
9 91
A
MERICAN
M
AGNETICS
, I
NC
. O
PERATION
: S
ETUP
S
UBMENU
D
ESCRIPTIONS
: P
ROTECTION
S
UBMENU
be increased (i.e. More sensitivity) until all quenches are
detected.
O
PERATIONAL
L
IMITS
40
This heads a menu subsection containing various constants
associated with protection based on a linear relationship for a
maximum allowable current, termed as
Ic
, given a temperature
measured via the Auxiliary Input 3 (see page 202). Press the
ENTER
key to access the associated submenu parameters.
The equations that relate the parameters in this subsection are
defined as:
where
Ic
is in Amperes,
IcSlope
is Amperes/Kelvin,
T
is the
Auxiliary Input channel 3 temperature in Kelvin,
IcOffset
is in
Amperes, and
T
max
is in Kelvin. The
Ic
limit is applied in a bipolar
fashion, i.e. it is applied to the magnet current
magnitude
.
The equations above define an operating region that is illustrated
in the “Ic vs. Tempeature” plot at the top of the following page,
with example parameter values of -22 A/K for
IcSlope
, 180 A for
IcOffset
, and 5.5 K for
T
max
. The valid operational region is
along and to the left of the line .
P
ROTECTION
M
ODE
This setting controls how the maximum current protection is
applied. If the Protection Mode setting is
Off
, then no additional
protection is applied.
41
40. The Operational Limits menu can be hidden with an internal hardware switch. If this menu is
not visible, then the hardware switch has been set to hide it. Contact an Authorized AMI
Technical Support Representative if you wish to enable this feature.
41. The Tmax parameter may still be used as part of the quench detection logic, see page 123.
+50.00 A — Operational Limits f(T)
+0.50 Vs Edit Constants
If
T T
max
≤
Ic IcSlope
( )
T IcOffset
( )
+ =

If
T T
max
>
Ic
0 =

+50.00 A — Protection Mode
+0.50 Vs Off On Entry Cont f(T)